28120953 has 12 divisors (see below), whose sum is σ = 43616400. Its totient is φ = 16069032.

The previous prime is 28120949. The next prime is 28121017. The reversal of 28120953 is 35902182.

It is a happy number.

It is not a de Polignac number, because 28120953 - 2² = 28120949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28120953.

It is not an unprimeable number, because it can be changed into a prime (28120903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95503 + ... + 95796.

It is an arithmetic number, because the mean of its divisors is an integer number (3634700).

Almost surely, 2^28120953 is an apocalyptic number.

It is an amenable number.

28120953 is a deficient number, since it is larger than the sum of its proper divisors (15495447).

28120953 is a wasteful number, since it uses less digits than its factorization.

28120953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191316 (or 191309 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28120953 is about 5302.9192903532. The cubic root of 28120953 is about 304.0955126070.

The spelling of 28120953 in words is "twenty-eight million, one hundred twenty thousand, nine hundred fifty-three".